Furnace



Jan. 12, w BEECHER FURNACE Filed Nov. 25, 192'? 2 Sheets-Sheet 1 1IIIIIIIII M I;-IIIlIlllll v I I g M INVENTOR BY WWI-M ATTORNEYS Jan. 12,1932. H. WKBEECHER 0 7 FURNACE Filed Nov. 25. 1927 2 Sheets-Sheet 2 WINVENTQR Patented Jan. 12, v 1932 UNITED STATES PATENT, OFFICE HENRYWARD BEECHER, or SEATTLE, wAsnrnen-roa, ASSIGNOR, BY Mnsivn ASSIGN-MEN'IS, r FULLER LEHIGH COMPANY, A CORPORATION or DELAWARE FURNACEApplication filed November 25, 1927. Serial No. 235,410.

tical section through the furnace, partly broken away; Fig. 2 is asection along the line 22 of Fig. 1; and Fig. 8 is a section at right 7angles to Fig. 2 along the line 33 thereof.

In the drawings reference character 1 in dicates an oven in front of thecombustion space proper of a boiler furnace into which oven solid fuelis introduced through the chute 2 and is ignited. The combustionproducts pass over the bridge wall 3 into the combustion space 4 of thefurnace. The bridge wall 3 maybe made hollow and air for combustionpurposes passes into it and thence through the openings 5 into thecombustion space 4. The furnace has side walls 6 and a floor 7. Anopening 8 is provided at the rear of the combustion space 4 immediatelyabove the floor and a burner 9, for gas, oil or pulverized fuel, islocated in the upper portion of the opening 8 and extends through therear wall. Dampers 10 are located in the opening 8 and serve forregulating the supply of air to the furnace.

A series of horizontally disposed plates 12, superposed one above theother, is located below the burner 9 with the edges of each of theplates extending farther into the furnace than the one immediately aboveit. Each of the plates 12 may be made in sections, if desired, and brickor-spacing blocks 13 of refractory material are placed between theplates12 and spaced from each other, so as to. leave openings 14 throughwhich air enters the furnace. The openings 14 are preferably so disposedthat a wider series of openings is provided below the lower plates thanbelow those near the top, as indicated in Fig. 2, so that the number ofair openings gradually diminishes from the lower to the upper plate 12.One edge of each of the plates 12 is supported by cross supports 15 thatmay be L-shaped in cross section, and the ends thereof project intorecesses 16 in the wallsof the furnace, and the other edges ofthep'lates are supported by resting upon the brick or blocks 13 below thesame.

. The operation-is as follows: WVhen it is desired to operate thefurnace with fuel from the burner 9 only, the dampers 10 are regulatedso as to provide the proper amount of air for the combustion, and theopenings provide for proper distribution of the air. Any ash or slagthat falls upon the projecting edges of the plates 12 can be removed bysimply pushing the same off through the holes 14 so thatthe air,passages will not become blocked. When it is desired to burn solid fuel,the same is introduced into the oven through the chute 2. Cinders thatpass over the bridge wall 3 and fall upon the plates 12 will burn andthe ashes that collect upon theseplatescanbe removed as above describedso that combustion air will have access to the fuel entering through theburner 9, as desired. It will be obvious that both solid fuel and fuelintroduced through the burner 9 can be burned in this furnace at thesame time. The furnace is especially useful in burning waste productsfrom paper mills or saw mills or waste bagasse from sugar plants, or anyother furnace wherein two different types of fuel are to be burnedindependently in different portions of the furnace enclosure, eitherconcurrently or alternatively.

I claim:

1. In combination, a furnace, an oven for burning solid fuel in front ofsaid furnace, a passageway for the hot products of combustion from saidoven to said furnace, a fuel burner, and a plurality of air supply ductswith ledges above them extending progressively into said furnace belowsaid burner to receive ashes and other material from said oven.

2. In combination, a furnace, an oven for burning solid fuel in front ofsaid furnace, a bridge wall between said oven and said furnace, apassageway for the hot products of combustion from said oven to saidfurnace over said bridge wall, a fuel burner, and a plurality of airsupply ducts with ledges above them extending progressively into saidfurnace below said burner to receive ashes and other material from saidoven.

3. In combination, a furnace, an oven for burning solid fuel in front ofsaid furnace,

a passageway for the hot products of combustion from said oven to saidfurnace, a hollow bridge wall between said oven and said furnaceprovided with air ports into said furnace, a fuel burner, and aplurality of air supply ducts with ledges above them extendingprogressively into said furnace below said burner to receive ashes andother material from said oven.

4. In a furnace, a fuel burner, and a series of rectangularly shaped airsupply ducts extending horizontally. into said furnace below saidburner, said ducts being arranged in rows with the lower rows wider thanthe upper ones and being made up of superposed plates each extendinginto said furnace farther than the one above it with vertical partitionsbetween said plates.

5. In a furnace, a burner adapted to project a stream of combustiblematerial into said furnace, and a series of parallel air supply ductsextending into said furnace to different distances below said burner,said ducts being formed by parallel plates with spacing blocks betweenthem.

HENRY WARD BEECHER;

